package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisIdWorker;
import com.hmdp.utils.SimpleRedisLock;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.redisson.client.RedisClient;
import org.springframework.aop.framework.AopContext;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.connection.stream.*;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.PostConstruct;
import javax.annotation.Resource;
import java.time.Duration;
import java.time.LocalDateTime;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 *
 */
@Slf4j
@Service
public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {
     @Resource
     private ISeckillVoucherService seckillVoucherService;
     @Resource
     private RedisIdWorker redisIdWorker;
     @Resource
     private RedisTemplate redisTemplate;
     @Resource
     private StringRedisTemplate stringRedisTemplate;
     @Resource
     private RedissonClient redissionClient;


    private static final DefaultRedisScript<Long> SECKILL_SCRIPT;

    static {
        SECKILL_SCRIPT = new DefaultRedisScript<>();
        SECKILL_SCRIPT.setLocation(new ClassPathResource("seckill.lua")); // 修复：使用正确的 ClassPathResource
        SECKILL_SCRIPT.setResultType(Long.class);
    }
   private BlockingQueue<VoucherOrder> orderTasks = new ArrayBlockingQueue<>(1024 * 1024);
    private static final ExecutorService SECKILL_ORDER_EXECUTOR = Executors.newSingleThreadExecutor();
    @PostConstruct
    private void init() {
        SECKILL_ORDER_EXECUTOR.submit(new VoucherOrderHandler());
    }
    private class VoucherOrderHandler implements Runnable {
        String queueName = "stream.orders";
        @Override
        public void run() {
            //获取消息队列中的订单信息
            while (true) {
                try {
                    //获取消息队列中的订单消息XREADGROUP GROUP g1 c1 COUNT 1 BLOCK 2000 STREAMS streams.order >
                    List<MapRecord<String, Object, Object>> list = stringRedisTemplate.opsForStream().read(
                            Consumer.from("g1","c1"),
                            StreamReadOptions.empty().count(1).block(Duration.ofSeconds(2)),
                            StreamOffset.create(queueName, ReadOffset.lastConsumed())
                    );

                    if (list == null || list.isEmpty()) {
                        continue;
                    }
                    //解析消息中的订单信息订单信息
                    MapRecord<String, Object, Object> record = list.get(0);
                    Map<Object, Object> values = record.getValue();
                    VoucherOrder voucherOrder = BeanUtil.fillBeanWithMap(values, new VoucherOrder(), true);
                    //如果获取失败，说明订单信息已经被处理，返回错误或重试
                    handleVoucherOrder(voucherOrder);
                    stringRedisTemplate.opsForStream().acknowledge(queueName,"g1",record.getId());
                }catch (Exception e){
                    log.error("处理订单异常",e);
                    handlePendingList();

                }

            }

        }

        private void handlePendingList() {
            while (true) {
                try {
                    //获取pendinglist队列中的订单消息XREADGROUP GROUP g1 c1 COUNT 1 BLOCK 2000 STREAMS streams.order >
                    List<MapRecord<String, Object, Object>> list = stringRedisTemplate.opsForStream().read(
                            Consumer.from("g1","c1"),
                            StreamReadOptions.empty().count(1),
                            StreamOffset.create(queueName, ReadOffset.from("0"))
                    );
                    if (list == null || list.isEmpty()) {
                        break;//如果没有异常，则结束循环
                    }
                    //解析消息中的订单信息订单信息
                    MapRecord<String, Object, Object> record = list.get(0);
                    Map<Object, Object> values = record.getValue();
                    VoucherOrder voucherOrder = BeanUtil.fillBeanWithMap(values, new VoucherOrder(), true);
                    //如果获取失败，说明订单信息已经被处理，返回错误或重试
                    handleVoucherOrder(voucherOrder);
                    stringRedisTemplate.opsForStream().acknowledge(queueName,"g1",record.getId());
                }catch (Exception e){
                    log.error("处理订单异常",e);
                    try {
                        Thread.sleep(20);
                    }catch (InterruptedException ex){
                        ex.printStackTrace();
                    }

                }

            }
        }
    }
//    private class VoucherOrderHandler implements Runnable {
//        @Override
//        public void run() {
//            while (true) {
//
//                try {
//                    //1.获取队列中的订单信息
//                    VoucherOrder voucherOrder = orderTasks.take();
//                    //2.创建订单
//                    handleVoucherOrder(voucherOrder);
//                }catch(Exception e){
//                    log.error("处理订单异常",e);
//                }
//            }
//
//        }
//    }

    private void handleVoucherOrder(VoucherOrder voucherOrder) {
        Long userId = voucherOrder.getUserId();
        //创建锁对象
        RLock lock = redissionClient.getLock("lock:order:" + userId);
        boolean isLock = lock.tryLock();
        if (!isLock) {
            log.error("不允许重复下单");
        }
        try {
            proxy.createVoucherOrder(voucherOrder);
        }finally {
            lock.unlock();
        }
    }
    private IVoucherOrderService proxy;
    @Override
     public Result seckillVoucher(Long voucherId) {
        Long userId = UserHolder.getUser().getId();
        //获取订单id
        Long orderId = redisIdWorker.nextId("order");
         //执行lua脚本
         Long result = stringRedisTemplate.execute(
                 SECKILL_SCRIPT, Collections.emptyList(),
                 voucherId.toString(),
                 userId.toString(),String.valueOf(orderId)
         );


         //不为0，代表没有购买资格
         int r=result.intValue();
         if (r!= 0) {
             return Result.fail(r == 1 ? "库存不足" : "不能重复下单");
         }

         //生成订单
//         VoucherOrder voucherOrder=new VoucherOrder();
//         voucherOrder.setId(orderId);
//         voucherOrder.setUserId(userId);
//         voucherOrder.setVoucherId(voucherId);
//         //创建阻塞队列
//         //获取代理对象
        proxy = (IVoucherOrderService) AopContext.currentProxy();
        return Result.ok(orderId);

         //返回订单id
     }
//    @Override
//     public Result seckillVoucher(Long voucherId) {
//        Long userId = UserHolder.getUser().getId();
//         //执行lua脚本
//         Long result = stringRedisTemplate.execute(
//                 SECKILL_SCRIPT, Collections.emptyList(),
//                 voucherId.toString(),
//                 userId.toString()
//         );
//
//
//         //不为0，代表没有购买资格
//         int r=result.intValue();
//         if (r!= 0) {
//             return Result.fail(r == 1 ? "库存不足" : "不能重复下单");
//         }
//
//         //生成订单
//         Long orderId =redisIdWorker.nextId("order");
//         VoucherOrder voucherOrder=new VoucherOrder();
//         voucherOrder.setId(orderId);
//         voucherOrder.setUserId(userId);
//         voucherOrder.setVoucherId(voucherId);
//         //创建阻塞队列
//         orderTasks.add(voucherOrder);
//         //获取代理对象
//        proxy = (IVoucherOrderService) AopContext.currentProxy();
//        return Result.ok(orderId);
//
//         //返回订单id
//     }

//    @Override
//     public Result seckillVoucher(Long voucherId) {
//        //获得id
//        SeckillVoucher voucher = seckillVoucherService.getById(voucherId);
//        voucher.getBeginTime();
//        if(voucher.getBeginTime().isAfter(LocalDateTime.now())){
//            return Result.fail("秒杀尚未开始");
//        }
//        if(voucher.getEndTime().isBefore(LocalDateTime.now())){
//            return Result.fail("秒杀已经结束");
//        }
//        if(voucher.getStock()<1){
//            return Result.fail("库存不足");
//        }
//        //一人一单
//        //查询数据库用户id跟优惠券id
//        Long userId = UserHolder.getUser().getId();
//        //创建锁
//        SimpleRedisLock lock = new SimpleRedisLock("order:" + userId, stringRedisTemplate);
//        boolean isLock = lock.tryLock(1200L);
//        if(!isLock){
//            return Result.fail("请勿重复下单");
//        }
//
//        try {
//            IVoucherOrderService proxy = (IVoucherOrderService) AopContext.currentProxy();
//            return proxy.createVoucherOrder(voucherId);
//        } catch (IllegalStateException e) {
//            throw new RuntimeException(e);
//        }finally {
//            lock.unlock();
//        }
//
//
//    }
    @Transactional
    public  void createVoucherOrder(VoucherOrder voucherOrder) {
        Long userId = UserHolder.getUser().getId();
        int count=query().eq("user_id",userId).eq("voucher_id", voucherOrder.getVoucherId()).count();
        if(count>0){
            log.error("用户已经购买过一次");
        }
        Boolean success=seckillVoucherService.update()
                .setSql("stock=stock-1")
                .eq("voucher_id", voucherOrder.getVoucherId()).gt("stock",0).update();

        //查询库存
        if(!success){
          log.error("库存不足");
        }
        //生成订单
        save(voucherOrder);
    }

}
